Page 3249 of 4555

TROUBLE DIAGNOSIS
ATC-71
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AT C
5. CHECK MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect each door motor connector.
3. Check continuity between mode door motor harness connector
M37 terminal 2 (B), air mix door motor harness connector M38
terminal 2 (B) or intake door motor harness connector M47 ter-
minal 2 (B) and ground.
OK or NG
OK >> GO TO 6.
NG >> Replace harness or connector.
6. CHECK MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect each door motor connector.
3. Reconnect each door motor connector.
4. Turn ignition switch ON.
5. Confirm each door motor operation.
OK or NG
OK >> (Return to operate normally.)
Poor contact in motor connector.
NG >> (Does not operate normally.)
GO TO 7.
7. CHECK AIR MIX DOOR MOTOR AND INTAKE DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect mode, air mix, and intake door motor connectors.
3. Reconnect air mix and intake door motor connectors.
4. Turn ignition switch ON.
5. Confirm air mix door motor and intake door motor operation.
OK or NG
OK >> (Air mix and intake door motors operate normally.)
Replace mode door motor.
NG >> (Air mix and intake door motors does not operate normally.)
GO TO 8.
8. CHECK MODE DOOR MOTOR AND INTAKE DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect air mix door motor connector.
3. Reconnect mode door motor connector.
4. Turn ignition switch ON.
5. Confirm mode door motor and intake door motor operation.
OK or NG
OK >> (Mode and intake door motors operate normally.)
Replace air mix door motor.
NG >> (Mode and intake door motors does not operate normally.)
GO TO 9. 2 – Ground : Continuity should exist.
RJIA1990E
Page 3250 of 4555
ATC-72
TROUBLE DIAGNOSIS
9. CHECK MODE DOOR MOTOR AND AIR MIX DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect intake door motor connector.
3. Reconnect air mix door motor connector.
4. Turn ignition switch ON.
5. Confirm mode door motor and air mix door motor operation.
OK or NG
OK >> (Mode and air mix door motors operate normally.)
Replace intake door motor.
NG >> (Mode and air mix door motors does not operate normally.)
Replace auto amp.
Page 3251 of 4555
TROUBLE DIAGNOSIS
ATC-73
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Mode Door Motor CircuitEJS004GX
SYMPTOM:
Air outlet does not change.
Mode door motor does not operate normally.
INSPECTION FLOW
*1ATC-32, "Discharge Air Flow".*2ATC-65, "Operational Check".*3ATC-59, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 1.
*4ATC-59, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5 to
7.*5ATC-109, "
Ambient Sensor Circuit".*6AT C - 111 , "In-Vehicle Sensor Cir-
cuit".
*7ATC-114, "
Sunload Sensor Circuit".*8ATC-117, "Intake Sensor Circuit".*9ATC-76, "Air Mix Door Motor Cir-
cuit".
RJIA3095E
Page 3252 of 4555

ATC-74
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
Auto amp.
Mode door motor (LCU)
A/C LAN system (PBR built-in air mix door motor, mode door motor and intake door motor)
In-vehicle sensor
Ambient sensor
Sunload sensor
Intake sensor
System Operation
The auto amp. receives data from each of the sensors. The auto amp. sends air mix door, mode door and
intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor
LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the auto amp. and each of the motor position
sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subse-
quently, HOT/COLD or DEF/VENT or FRESH/RECIRCULATION operation is selected. The new selection
data is returned to the auto amp.
Mode Door Control Specification
*10ATC-59, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 9.*11AT C - 6 9 , "
LAN System Circuit".*12ATC-134, "MODE DOOR MOTOR".
*13ATC-34, "
SYMPTOM TABLE".
RJIA2828E
RHA384HA
Page 3253 of 4555
TROUBLE DIAGNOSIS
ATC-75
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COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit. It
rotates so that air is discharged from the outlet set by the auto amp.
Motor rotation is conveyed to a link which activates the mode door.
DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR
SYMPTOM: Mode door motor does not operate normally.
Perform diagnostic procedure. Refer to AT C - 6 9 , "
DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT" .
RJIA0513E
RJIA0514E
Page 3254 of 4555
ATC-76
TROUBLE DIAGNOSIS
Air Mix Door Motor CircuitEJS004GY
SYMPTOM:
Discharge air temperature does not change.
Air mix door motor does not operate.
INSPECTION FLOW
*1AT C - 6 5 , "Operational Check".*2AT C - 5 9 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 1.*3ATC-59, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5 to 7.
*4ATC-109, "
Ambient Sensor Circuit".*5AT C - 111 , "In-Vehicle Sensor Circuit".*6ATC-114, "Sunload Sensor Circuit".
*7AT C - 11 7 , "
Intake Sensor Circuit".*8AT C - 7 8 , "DIAGNOSTIC PROCE-
DURE FOR AIR MIX DOOR
MOTOR".*9ATC-34, "
SYMPTOM TABLE".
*10AT C - 5 9 , "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 9.*11AT C - 6 9 , "
LAN System Circuit".*12ATC-135, "AIR MIX DOOR
MOTOR".
RJIA3097E
Page 3255 of 4555

TROUBLE DIAGNOSIS
ATC-77
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AT C
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
Auto amp.
Air mix door motor (LCU)
A/C LAN system (PBR built-in air mix door motor, mode door motor and intake door motor)
In-vehicle sensor
Ambient sensor
Sunload sensor
Intake sensor
System Operation
The auto amp. receives data from each of the sensors. The auto amp sends air mix door, mode door and
intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor
LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the auto amp. and each of the motor position
sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subse-
quently, HOT/COLD or DEF/VENT or FRESH/RECIRCULATION operation is selected. The new selection
data is returned to the auto amp.
Air Mix Door Control Specification
RHA424GB
RHA457H
Page 3256 of 4555
ATC-78
TROUBLE DIAGNOSIS
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor is attached to the heater & cooling unit. It
rotates so that the air mix door is opened or closed to a position set
by the auto amp. The air mix door position is fed back to the auto
amp. by PBR built-in air mix door motor.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnostic procedure. Refer to AT C - 6 9 , "
DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT" .
RJIA0516E
RJIA0517E